Tubular grinding-mill.



R. STBINBAUH.

TUBULAR GRINDING MILL.

APPLICATION FILED JAN. 9, 1914.

Patented Mar. 2, 1915.

2 SHEETS-SHEET 1.

msoma Patented Mar. 2, 1915.

2 SHEETS-MEET 2.

""I'IIIIlI Q4/5714 A z R. STEINBACH.

TUBULAR GRINDING MILL.

APPLICATION FILED JAN. 9, 1914,

QQLE QQW BEINHOLD STEINBACH, MfiGDEIBU'RG-IBUCKAU, GERMANY, ASSIGN OB.T0 FRIED.

KRUPP, AKTIENGESELLSCHAFT, GRUSONWERK, OF MAG-DEBURG-BUCKAU, GER- MANY.

Toner-Ar. GRINDING-MILL.

wa ers.

To all whom it may concern: I

Be it known that I, REINHOLD STEINBAOH, assistant' Works manager, asubject of the King of Prussia, and resident of Madgeburg-Buckau, GermanEmpire, have invented certain useful Improvements in or Be.- lating toTubular Grinding-Mills, of which the following is a specification,

This invention relates to compound to bular grinding mills, the chiefobject be ing to enable the material to be readily conveyed from onegrinding chamber, to the other within the interior of the casing orshell of the mill so as to allow of the casing or shell being madeimperforate and of smaller circumference and of a simpler form thanheretofore. e

According to this invention the mill is provided with an imperforatecasing or shell and the material under treatment is conveyed from onegrinding chambertov the othenthrough a number of passages disposedaround the inner surface of the easing or shell and formed in or betweenthe grinding plates of the respective vchambers. The said passages areprovided with pockets or enlargements which, during the rotation of themill, are adapted to collect the ground material in the first chamberand subsequently discharge the same into inclined portions of thepassages leading to the second grinding chamber of the mill for fur thertreatment. The inlet opening to each of the passages is provided with asieve or the like which allows of the passage of the fine material intothe pocket thereof for con veyance to the-next grinding chamber.

In order that the said invention may be clearly understood and readilycarried into effect ll will proceed to describe the same more fully withreference to the accompanying drawings in which Figure 1 is alongitudinal section of the improved compound mill comprising twochambers. Fig. 2 represents a portion of Fig. 1 drawn to a larger scalefor illustrating more clearly than in Fig. 1 the construe tional formofthe improved device therein shown. Fig. 3 is across section on theline A-.-B of Fig. 2. Fig. 4 is a cross section on the line C Dof Fig.3. Fig. 5 is a longitudi nal section and Fig. 6 a cross section illusrtrating another constructional form of the improved device. Fig. 7illustrates a detail in section. I,

v specification of Letters Patent.

' ond or fine. grinding chamber cl.v Between the various grinding plates6 of the preliminary chamber which bear against this partition, openingsf are provided which are covered with sieves g and lead to pocketlikecollecting chambers it. From these pockets h passages 70 branch andextend through the partition I) or if the partition reaches so far asthe casing of the mill they pass around it and lead to correspondingpassages in the grinding plates n of the second chamber (2. The latterpassages open into the inner portion of the chamber d; the passages 70and m may either be cut in the under face of the grinding plates e and nso that the casing or shell 0. forms one wall of each passage, or theymay be located in the interior of the grinding plates. In

the first caseit is preferable to cover those,

portions of the inner face of the casing or shell which -bound thepassages, with lining plates-9 Fig. 7 in order to protect the casing orshell from wear. The plates 9 may be fixed to the casing but apreferable arrange- I ment is to secure them to the grinding platescasing or shell of the mill.

In the construction illustrated in Figs. 1 to 4 when the casing arotates, the material ingthe chamber '0 falls continuously through theopenings f in the plates 0 which for the time being are located atthebottom in the downward movement, onto the sieves 9. These sievesretain the coarse material, while the fine material. falls through themand collects in the pockets h located below. The material remains in thepockets 7:. until the upward movement takes place when the said materialbegins to slide downward, it is then conducted through the passages kand m into the chamber d.

The construction illustrated in Figs. 5 and 6 differs from theconstruction described above, in that the sieves are arranged in thepockets It so as to obtain a larger-sieve area. The material fallsthrough slots or openings 0 formed in the grinding plates 6 g PatentedMar. 2, i915.

Application filed January 9, 1914. Serial No. 811,223.

of the chamber 0 onto the sieves, the coarse materials remains behindwhile the fine material falls through and collects beneath the sieves.In the upward movement, the coarse material slides back through passagesp into the chamber 0 while the fine material passes through the passagesk and m into the chamber d.

Having now particularly described and ascertained the nature of my saidinvention and in What manner the same is to be performed I declare thatwhat I claim is 1. A compound grinding mill comprising an imperforatedrum having a plurality of partitioned oif chambersin alinement the onewith the other, grinding plates on either side of a partition, saidgrinding plates being provided with a plurality of passages from onechamber to the next and situated adjacent the concave surface of thedrum, said passages being obliquely directed relative to said concavesurface so as to facilitate the conveyance from one chamber to the nextin approximately. axial direction near the wall of the drum of thematerial under treatment. I

2. A compound grinding mill comprising an imperforate drum having aplurality of partitioned ofi' chambers in alinement theone with theother, grinding plates on either ,side of a partition, said grindingplates being provided with a plurality of passages from one chamber tothe next and situated adjacent the concave surface of the drum, saidpassages being obliquely directed relative to said concave surface so asto facilitate the conveyance in approximately axial direction of thematerial under treatment, said grinding plates also having a pocketforeach of said passages situated at the foremost side of the passageduring rotation, said pocket collecting material ina preceding chamberprior to discharging it through a passage into a subsequent chamber.

3. A compound grinding mill comprising an imperforate drum having aplurality of partitioned off chambers in alinement the one with theother, grinding plates on either side of a partition, said grindingplates being provided with a plurality of passages from one chamber tothe next and situated adjacent the concave surface of the drum, saidpassages being obliquely directed relative to said concave surface so asto facilitate the conveyance in approximately axial direction of thematerial under treatment, said grinding plates also having a pocket foreach of said passages situated at the foremost side of the passageduring rotation, said pocket collecting material in a preceding chamberprior to discharging it through a'passage into a subsequent chamber, and

I means at the entrance of said pocket for segregating'the finer fromthe coarser mac5 teri 1 4, A compound grinding mill comprising animperforate drum having a plurality of partitioned ofl chambers inalinement the one with the other," grinding plates on either side of abeing provi ed with a plurality of passages artition, =said grmding.pla'tes lO from one chamber to the next and situated in the body of thegrinding plates adjacent the concave surface of the drum, said passagesbeing obliquely directed relative to said concave surface so as tofacilitate the conveyance in approximately axial direction of thematerial under treatment;

the side of the passages adjacent the concave surface of the drum beingopen, said passages being obliquely directed relative to saidconcavesurface so as to facilitate the conveyance in approximately axial.direction of the materlalunder treatment.

6. A compound grinding mill comprising an imperforate'drum having aplurality of partitioned 01f chambers in alinement the one with theother, grinding plates on either side of a partition, said grindingplates being provided with a plurality of passages es from one chamberto the next and situated in the body of the grinding plates, I

from one chamber to the next being provided in the body of the grindingplates, the side of the passages ad] acent I the concave surface of thedrum-being open a liner covering the openvside of each passage, saidpassage being obliquely directed relative to said concave surface so asto facilitate the conveyance'in approximately axial direction 7 of thematerial under treatment.

7 A compound grindin mill comprising an imperforate drum having apluralityof partitioned-off chambers in alinement'the one with theother, grindin plates on either side of a partition, said grindingplates being provided with a plurality of passages from one chamber tothe next and situated in the body of the grinding plates, the side ofthe passages adjacent the concave surface of the drum being open; and aliner secured in lposition and covering the 'open side of eac passage,said passagesbeing obliquely directed relative to said concave surfaceso as to facilitate the conveyance in a proximately axial direction ofthe material under treatment.

8. A compound grindin mill comprisin an imperforate drum having alurality o partitioned ofi chambers in almement the one with the other,grinding plates on either side of a partition, said grmding plates being provided with a plurality of passages from one chamber to the nextand situated in the body of the grinding plates, the side of thepassages adjacent the concave surface of the drum being open; and aliner covering the open side of each passage, said liners being clampedin position between said grinding plates and the concave surface of thedrum.

9. A compound grinding mill comprising an imperforate drum having aplurality of partitioned 01f chambers in alinement the one With theother, grinding plates on either side of a partition, said grindingplates being provided with a plurality of passages from one chambertothe next and situated adjacent the concave surface of the drum, saidpassages being obliquely directed relative to said concave surface so asto facilitate the conveyance in approximately axial direction of thematerial under treatment, said grinding plates also having a pocket foreach of said passages situated at the foremost side of the passageduring rotation, said pocket collecting material in a preceding chamberprior to discharging it through a passage into a subsequent chamher; asieve at the entrance of said pocket for segregating the finer from thecoarser material, whereby the coarser material Will be returned to theinterior of a chamber once for every revolution of the drum.

10. A compound grinding mill comprising an imperforate drum having aplurality of partitioned oif chambers in alinement the one with theother, grinding plates on either side of a partition, said grindingplates being provided with a plurality of passages from one chamber tothe next and situated adjacent the concave surface of the drum, saidpassages being obliquely directed relative to said concave surface so asto facilitate the conveyance in approximately axial direction of thematerial under treatment, said grinding plates also having a pocket foreach .of said passages situated at the foremost side of the passageduring rotation, said pocket collecting material in a preceding chamberprior to discharging it through a passage into a subsequent chamber;each pocket being connected With the interior of a chamber.

11 A compound grinding mill comprising an imperforate drum having aplurality of partitioned off chambers in alinement the one with theother, grinding plates on either side of a partition, said grindingplates being provided With a plurality of passages from one chamber tothe next and situated adjacent the concave surface of the drum, saidpassages being obliquely directed relative to said concave surface so asto facilitate the conveyance in approximately axial direction of thematerial under treatment,

said grinding plates also having a pocket for each of said passagessituated at the foremost. side of the passage during rotation, saidpocket collecting material in a preceding chamber prior to dischargingit through a passage into a subsequent chamber each pocket beingconnected With the interior of a chamber; and a sieve at the entrance ofsaid pocket for segregating the finer from the coarser material wherebythe coarser material Will be returned to the interior of a chamber oncefor every revolution of the drum.

The foregoing specification signed at Magdeburg this 19th day ofDecember, 1914:.

REINHOLD STEINBACH.

Witnesses:

HERMANN STEPHANI, WILI-IELM FLEISCHBACK.

